21913416 has 80 divisors (see below), whose sum is σ = 70160640. Its totient is φ = 6259680.

The previous prime is 21913399. The next prime is 21913427. The reversal of 21913416 is 61431912.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 21913416.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2121 + ... + 6951.

It is an arithmetic number, because the mean of its divisors is an integer number (877008).

Almost surely, 2^21913416 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21913416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35080320).

21913416 is an abundant number, since it is smaller than the sum of its proper divisors (48247224).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21913416 is a wasteful number, since it uses less digits than its factorization.

21913416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4856 (or 4843 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 21913416 is about 4681.1767751282. The cubic root of 21913416 is about 279.8358561741.

The spelling of 21913416 in words is "twenty-one million, nine hundred thirteen thousand, four hundred sixteen".